function join_meeting() {
    var nick_name=$("#nick_name").val();
    var url=$("#url").val();
    if(nick_name=="") {
        alert("请输入姓名");
        return;
    }
    url=url+"?nickName="+nick_name;
    window.open(url);
}
function show2(){
    document.getElementById("shadow").style.display="";
    document.getElementById("name_pop").style.display="";
}
function show(){
    document.getElementById("shadow").style.display="";
    document.getElementById("chat_pop").style.display="";
}
function hide2(){
    document.getElementById("shadow").style.display="none";
    document.getElementById("name_pop").style.display="none";
}
function hide(){
    document.getElementById("shadow").style.display="none";
    document.getElementById("chat_pop").style.display="none";
}
